Originally Posted by
Often1
Any non-compliant use by the Passenger (for example, if he or she does not use the first Coupon or if the Coupons are not used in the order in which they were issued) noticed on the day of travel will result in the payment of a extra fixed-rate fee at the airport: €125 on short-haul flights (metropolitan France and Corsica), €250 for an Economy medium-haul flight, €500 for a Business medium-haul flight, €500 for an Economy or Premium Economy long-haul flight, €1,500 for a Business long-haul flight and €3,000 for a La Première long-haul flight (or the equivalent in the local currency).
Doesn't say anything about dropping the last segment there. It says "non-compliant use" Can not using the last coupon be considered use of the coupon? That seems a stretch, as the coupons are clearly treated as individual things not an overall package of flights as one thing. The first coupon is used, and the remaining (except the last) are used in order, which is in compliance. It doesn't say that all must be used, just that they need to be used in order.
Similarly the penalty for out of order use is demanding payment at the airport on day of travel, if I wish to travel. So if I don't travel and don't go through the airport, the condition is also not met, the last coupon is simply forfeited.